Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: Superconductivity - Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 9.4: Hauptvortrag

Montag, 26. März 2007, 17:00–17:30, H20

Crossed Andreev Reflection in Superconductor-Ferromagnet Hybrid Structures — •Detlef Beckmann¹, Jakob Brauer¹, Dagmar Rall¹, and Hilbert v. Löhneysen^2,3 — ¹Forschungszentrum Karlsruhe, Institut für Nanotechnologie — ²Forschungszentrum Karlsruhe, Institut für Festkörperphysik — ³Physikalisches Institut, Universität Karlsruhe

We report on conductance measurements on multiterminal superconductor nanostructures, where two ferromagnetic or normal-metal leads form tunnel contacts to a single superconductor. The focus is on transport at energies below the superconducting gap, and length scales below the coherence length. We observe a negative non-local resistance which can be interpreted in terms of crossed Andreev reflection, a process where an electron incident from one of the leads gets reflected as a hole into the other, thereby creating a pair of spatially separated, entangled particles.
D. Beckmann, H.B. Weber and H.v. Löhneysen, Phys. Rev. Lett. 93, 197003 (2004)
D. Beckmann and H.v. Löhneysen, cond-mat/0609766